2675 문자열 반복

import java.util.*;
 
public class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        int T = sc.nextInt();
        int R;
        String[] S = new String[T];
        String temp;
 
        for(int i=0; i<T; i++) {
            R = sc.nextInt();
            S[i] = sc.next();
            temp = "";
            for(int j=0; j<S[i].length(); j++) {
                for(int k=0; k<R; k++) {
                    temp += S[i].charAt(j);
                }
            }
            S[i] = temp;
        }
 
        for(int i=0; i<T; i++) {
            System.out.println(S[i]);
        }
    }
}